Under state law, if a person fears death or great bodily harm, he can use deadly force, even if retreat is possible. Since it was passed in 2005, the defense has been used in more than 200 cases. In many, the defendant has gone free.

Reeves told Pasco County deputies that Oulson stood and struck him in the face with an unknown object when they were arguing inside a Wesley Chapel movie theater during previews before Lone Survivor. Reeves said he was "in fear of being attacked," an arrest affidavit reads.

The Pasco County Sheriff's Office realized the stand your ground law could come into play in court. On Tuesday, Pasco Sheriff Chris Nocco said deputies investigated that angle and consulted with prosecutors. They do not believe it is a viable defense here.

He did not elaborate. This is what deputies have released:

Reeves wanted Oulson to stop texting. He walked out of the theater and complained to management. When Reeves returned to the 1:20 p.m. showing, "words were exchanged" and Oulson threw a bag of popcorn at Reeves, an arrest affidavit states.

Witnesses say the pair did not throw punches. Reeves pulled a gun and shot Oulson, who was pronounced dead at a hospital.

Several lawyers told the Tampa Bay Times that there are too many unknowns right now to determine whether stand your ground could be used successfully in court. Many factors could be relevant, said Stetson University College of Law professor Charles Rose.

For one, when Oulson threw popcorn, that was legally an assault. But was it reasonable to respond with deadly force simply because of the popcorn? No, Rose believes.

However, it becomes more complicated if Reeves considered it to be one step in an escalating response from Oulson. If he feared that Oulson would next come over the seats and physically attack him — and if Reeves felt he wouldn't be able to handle an attack from a younger man — jurors might consider deadly force reasonable, the lawyer said.

"Here's the problem: We're trying to look into the mind of the defendant and posit what he thought was happening," Rose said. "That's often why these cases go trial — because you just can't tell."

Age, physical stature and each man's strength could come into play, Rose said.

Plant City lawyer Ron Tulin agreed. Tulin built a stand your ground defense for manslaughter suspect Trevor Dooley that was ultimately unsuccessful. Jurors convicted Dooley, who was sentenced to eight years for fatally shooting his Valrico neighbor at a basketball court in 2010.

That case demonstrates the importance of witness statements in cases of self-defense.

Dooley, who was 69 at the time, shot David James, 41, in a dispute about whether a skateboarder was allowed to use the basketball courts.

Tulin argued that James had been choking Dooley and that Dooley feared for his life. But witnesses disputed that version of events. People saw Dooley flash a gun and said that James was trying to wrestle it from Dooley's hands.

Tulin stands by his former client and says he thinks Dooley has a good chance of winning an appeal. On Tuesday, the lawyer posted a warning on Facebook, telling readers that the entire story of the Pasco movie theater shooting likely hasn't been told.